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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
5 days
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Difficulty:
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greedy
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
389A
Fox and Number Game
greedy
,
math
1000
x13855
388C
Fox and Card Game
games
,
greedy
,
sortings
2000
x3093
388A
Fox and Box Accumulation
greedy
,
sortings
1400
x11356
387C
George and Number
greedy
,
implementation
1700
x2161
387B
George and Round
brute force
,
greedy
,
two pointers
1200
x11927
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x9547
385A
Bear and Raspberry
brute force
,
greedy
,
implementation
1000
x16237
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3488
383A
Milking cows
data structures
,
greedy
1600
x5213
382A
Ksenia and Pan Scales
greedy
,
implementation
1100
x11802
381B
Sereja and Stairs
greedy
,
implementation
,
sortings
1100
x6589
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x60748
379C
New Year Ratings Change
greedy
,
sortings
1400
x6494
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x1976
374B
Inna and Nine
combinatorics
,
greedy
1500
x3234
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2843
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x12399
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1207
371A
K-Periodic Array
greedy
,
implementation
,
math
1000
x5954
370E
Summer Reading
dp
,
greedy
2500
x230
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x613
370C
Mittens
constructive algorithms
,
greedy
,
sortings
1800
x1504
369A
Valera and Plates
greedy
,
implementation
900
x10810
367C
Sereja and the Arrangement of Numbers
graphs
,
greedy
,
sortings
2000
x1703
364B
Free Market
dp
,
greedy
2200
x1150
363D
Renting Bikes
binary search
,
greedy
1800
x3752
363C
Fixing Typos
greedy
,
implementation
1400
x13082
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x896
362A
Two Semiknights Meet
greedy
,
math
1500
x2630
360E
Levko and Game
graphs
,
greedy
,
shortest paths
2800
x676
360A
Levko and Array Recovery
greedy
,
implementation
1700
x2023
359A
Table
constructive algorithms
,
greedy
,
implementation
1000
x8387
358D
Dima and Hares
dp
,
greedy
1800
x3894
358C
Dima and Containers
constructive algorithms
,
greedy
,
implementation
2000
x1952
357A
Group of Students
brute force
,
greedy
,
implementation
1000
x6702
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x936
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1229
355B
Vasya and Public Transport
greedy
,
implementation
1100
x4433
354A
Vasya and Robot
brute force
,
greedy
,
math
1500
x5398
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x569
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2177
351E
Jeff and Permutation
greedy
2200
x1510
351A
Jeff and Rounding
dp
,
greedy
,
implementation
,
math
1800
x2683
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6462
350A
TL
brute force
,
greedy
,
implementation
1200
x15995
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x13521
349A
Cinema Line
greedy
,
implementation
1100
x28779
346C
Number Transformation II
greedy
,
math
2200
x1419
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x688
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x2906
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x13073
342B
Xenia and Spies
brute force
,
greedy
,
implementation
1500
x3985
342A
Xenia and Divisors
greedy
,
implementation
1200
x12143
341E
Candies Game
constructive algorithms
,
greedy
3000
x428
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x538
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8149
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x199403
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4777
337B
Routine Problem
greedy
,
math
,
number theory
1400
x9102
337A
Puzzles
greedy
900
x75838
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x2373
335F
Buy One, Get One Free
dp
,
greedy
3000
x459
335A
Banana
binary search
,
constructive algorithms
,
greedy
1400
x2516
333B
Chips
greedy
1800
x2603
333A
Secrets
greedy
1600
x3931
332E
Binary Key
dp
,
greedy
,
implementation
2400
x294
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x885
329A
Purification
constructive algorithms
,
greedy
1500
x4593
328B
Sheldon and Ice Pieces
greedy
1500
x1259
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x752
322A
Ciel and Dancing
greedy
1000
x8093
321D
Ciel and Flipboard
dp
,
greedy
,
math
2900
x527
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6822
321B
Ciel and Duel
dp
,
flows
,
greedy
1900
x2965
320A
Magic Numbers
brute force
,
greedy
900
x33819
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x613
316A1
Special Task
greedy
1100
x2594
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x541
313C
Ilya and Matrix
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x5527
309E
Sheep
binary search
,
greedy
2900
x217
309C
Memory for Arrays
binary search
,
bitmasks
,
greedy
1900
x1293
306B
Optimizer
data structures
,
greedy
,
sortings
2100
x437
305C
Ivan and Powers of Two
greedy
,
implementation
1600
x2420
298B
Sail
brute force
,
greedy
,
implementation
1200
x13573
298A
Snow Footprints
greedy
,
implementation
1300
x10526
297B
Fish Weight
constructive algorithms
,
greedy
1600
x3447
296A
Yaroslav and Permutations
greedy
,
math
1100
x22049
294B
Shaass and Bookshelf
dp
,
greedy
1700
x4381
293A
Weird Game
games
,
greedy
1500
x2814
291D
Parallel Programming
*special problem
,
greedy
1600
x1467
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x127
288A
Polo the Penguin and Strings
greedy
1300
x6292
286C
Main Sequence
greedy
,
implementation
2100
x1283
285C
Building Permutation
greedy
,
implementation
,
sortings
1200
x22533
285A
Slightly Decreasing Permutations
greedy
,
implementation
1100
x13117
282B
Painting Eggs
greedy
,
math
1500
x12584
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1410
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x13033
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x24124
276B
Little Girl and Game
games
,
greedy
1300
x27324
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